I think Lord Downpatrick is behind the York princesses, closer to the aisle, and Cassius Taylor is further up behind the Phillips. They both wear a beard, and are sitting in the same row. Cassius is sitting next to his father.

It was all very moving and incredibly lovely that practically the entire extended family belonging to the British Royal family turned up to a thanksgiving to celebrate this milestone of the Queen and Prince Philip. Don't let it rain on the celebrations tomorrow!